class_docstr: Unit tests for the
  :func:`networkx.algorithms.community.centrality.girvan_newman`
  function.
code: def test_no_edges(self):
      G = nx.empty_graph(3)
      communities = list(nx.community.girvan_newman(G))
      assert len(communities) == 1
      validate_communities(communities[0], [{0}, {1}, {2}])
  
file_path: networkx/networkx/algorithms/community/tests/test_centrality.py
imports: from operator import itemgetter
  import networkx
label_desc: Use image node_id 1 for calling the TestGirvanNewman obj's underlying member method code with example usage: obj.test_no_edges() without return types